from pathlib import Path
import csv
from datetime import datetime
import matplotlib.pyplot as plt

path = Path('death_valley_2021_simple.csv')
lines = path.read_text().splitlines()

reader = csv.reader(lines)
header_row = next(reader)

# 提取最高温度
dates,highs,lows = [],[],[]
for row in reader:
    current_date = datetime.strptime(row[2],'%Y-%m-%d')
    try:
        high = int(row[3])
        low = int(row[4])
    except ValueError:
        print(f"Missing data for {current_date}")
    else:
        dates.append(current_date)
        highs.append(high)
        lows.append(low)

# 根据最高温度绘图
plt.style.use('seaborn-v0_8')
fig,ax = plt.subplots()
ax.plot(dates,highs,color = 'red',alpha=0.5)
ax.plot(dates,lows,color = 'blue',alpha=0.5)
ax.fill_between(dates,highs,lows,facecolor = 'blue',alpha=0.1)

# 设置绘图的格式
title = 'Daily High and Low Temperatures ,2021\nDeath Valley,CA'
ax.set_title(title,fontsize=24)
ax.set_xlabel('',fontsize = 16)
fig.autofmt_xdate()
ax.set_ylabel('Temperature(F)',fontsize=16)
ax.tick_params(labelsize=16)

# 绘图
plt.show()